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<h2><a href="closure_goog_events_browserfeature.js.html">browserfeature.js</a></h2>

<pre class="prettyprint lang-js">
<a name="line1"></a>// Copyright 2010 The Closure Library Authors. All Rights Reserved.
<a name="line2"></a>//
<a name="line3"></a>// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);
<a name="line4"></a>// you may not use this file except in compliance with the License.
<a name="line5"></a>// You may obtain a copy of the License at
<a name="line6"></a>//
<a name="line7"></a>//      http://www.apache.org/licenses/LICENSE-2.0
<a name="line8"></a>//
<a name="line9"></a>// Unless required by applicable law or agreed to in writing, software
<a name="line10"></a>// distributed under the License is distributed on an &quot;AS-IS&quot; BASIS,
<a name="line11"></a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<a name="line12"></a>// See the License for the specific language governing permissions and
<a name="line13"></a>// limitations under the License.
<a name="line14"></a>
<a name="line15"></a>/**
<a name="line16"></a> * @fileoverview Browser capability checks for the events package.
<a name="line17"></a> *
<a name="line18"></a> */
<a name="line19"></a>
<a name="line20"></a>
<a name="line21"></a>goog.provide(&#39;goog.events.BrowserFeature&#39;);
<a name="line22"></a>
<a name="line23"></a>goog.require(&#39;goog.userAgent&#39;);
<a name="line24"></a>
<a name="line25"></a>
<a name="line26"></a>/**
<a name="line27"></a> * Enum of browser capabilities.
<a name="line28"></a> * @enum {boolean}
<a name="line29"></a> */
<a name="line30"></a>goog.events.BrowserFeature = {
<a name="line31"></a>  /**
<a name="line32"></a>   * Whether the button attribute of the event is W3C compliant.  False in
<a name="line33"></a>   * Internet Explorer prior to version 9; document-version dependent.
<a name="line34"></a>   */
<a name="line35"></a>  HAS_W3C_BUTTON: !goog.userAgent.IE || goog.userAgent.isDocumentMode(9),
<a name="line36"></a>
<a name="line37"></a>  /**
<a name="line38"></a>   * Whether the browser supports full W3C event model.
<a name="line39"></a>   */
<a name="line40"></a>  HAS_W3C_EVENT_SUPPORT: !goog.userAgent.IE || goog.userAgent.isDocumentMode(9),
<a name="line41"></a>
<a name="line42"></a>  /**
<a name="line43"></a>   * To prevent default in IE7-8 for certain keydown events we need set the
<a name="line44"></a>   * keyCode to -1.
<a name="line45"></a>   */
<a name="line46"></a>  SET_KEY_CODE_TO_PREVENT_DEFAULT: goog.userAgent.IE &amp;&amp;
<a name="line47"></a>      !goog.userAgent.isVersion(&#39;9&#39;),
<a name="line48"></a>
<a name="line49"></a>  /**
<a name="line50"></a>   * Whether the {@code navigator.onLine} property is supported.
<a name="line51"></a>   */
<a name="line52"></a>  HAS_NAVIGATOR_ONLINE_PROPERTY: !goog.userAgent.WEBKIT ||
<a name="line53"></a>      goog.userAgent.isVersion(&#39;528&#39;),
<a name="line54"></a>
<a name="line55"></a>  /**
<a name="line56"></a>   * Whether HTML5 network online/offline events are supported.
<a name="line57"></a>   */
<a name="line58"></a>  HAS_HTML5_NETWORK_EVENT_SUPPORT:
<a name="line59"></a>      goog.userAgent.GECKO &amp;&amp; goog.userAgent.isVersion(&#39;1.9b&#39;) ||
<a name="line60"></a>      goog.userAgent.IE &amp;&amp; goog.userAgent.isVersion(&#39;8&#39;) ||
<a name="line61"></a>      goog.userAgent.OPERA &amp;&amp; goog.userAgent.isVersion(&#39;9.5&#39;) ||
<a name="line62"></a>      goog.userAgent.WEBKIT &amp;&amp; goog.userAgent.isVersion(&#39;528&#39;),
<a name="line63"></a>
<a name="line64"></a>  /**
<a name="line65"></a>   * Whether HTML5 network events fire on document.body, or otherwise the
<a name="line66"></a>   * window.
<a name="line67"></a>   */
<a name="line68"></a>  HTML5_NETWORK_EVENTS_FIRE_ON_BODY:
<a name="line69"></a>      goog.userAgent.GECKO &amp;&amp; !goog.userAgent.isVersion(&#39;8&#39;) ||
<a name="line70"></a>      goog.userAgent.IE &amp;&amp; !goog.userAgent.isVersion(&#39;9&#39;),
<a name="line71"></a>
<a name="line72"></a>  /**
<a name="line73"></a>   * Whether touch is enabled in the browser.
<a name="line74"></a>   */
<a name="line75"></a>  TOUCH_ENABLED:
<a name="line76"></a>      (&#39;ontouchstart&#39; in goog.global ||
<a name="line77"></a>          !!(goog.global[&#39;document&#39;] &amp;&amp;
<a name="line78"></a>             document.documentElement &amp;&amp;
<a name="line79"></a>             &#39;ontouchstart&#39; in document.documentElement) ||
<a name="line80"></a>          // IE10 uses non-standard touch events, so it has a different check.
<a name="line81"></a>          !!(goog.global[&#39;navigator&#39;] &amp;&amp;
<a name="line82"></a>              goog.global[&#39;navigator&#39;][&#39;msMaxTouchPoints&#39;]))
<a name="line83"></a>};
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